Implementation Considerations

Right-Sizing Recommendations

This solution offers recommendations as a starting point to help identify incorrectly
sized Amazon EC2 instances. The resulting .csv file provides an analysis of each instance's
provisioned size and utilization to help customers determine the most appropriate
instance
type for their workloads. For detailed information on how the results are calculated,
see
Appendix A: Right Sizing Logic.

This solution provides prescriptive instance type recommendations. Before incorporating
these changes into your overall capacity management processes, we recommend that you
test the
proposed Amazon EC2 instances to ensure they are properly sized to fulfill their expected
role.

Data Limits

Note that the CloudWatch metrics used in the analysis reflect the last two weeks of
Amazon EC2 usage
data. Therefore, be aware of the impact of seasonal or business cycles on the metrics
and
results.

The EC2 Right Sizing solution pulls utilization metrics for instances that are running
or
stopped (at the time of solution deployment) in order to provide recommendations for
existing
resources. This solution does not analyze usage or provide recommendations for instances
that
were terminated manually, as part of an Auto Scaling group, or for any other reason.

For customers who use Consolidated Billing to manage payment for multiple accounts, this solution will
analyze Amazon EC2 instances only for the account in which it is deployed (whether
that is the
payer account or a different linked account).

Regional Deployments

This EC2 Right Sizing solution uses an AWS Lambda function to configure the stack
resources, therefore you must deploy the solution in an AWS Region that supports AWS
Lambda.
For the most current AWS Lambda availability by region, see AWS service
offerings by region. Once deployed, the solution will automatically analyze usage
data for all Amazon EC2 instances in all AWS Regions of a customer’s account.

Note

At the time of
publication, this does not include AWS GovCloud (US-West), Asia Pacific (Singapore)
Region, or
China (Beijing) Region.

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